plural vectors
1
mathematics
: a quantity (such as velocity) that has size and direction
2
technical
: the course or direction of an airplane
3
biology
: an insect, animal, etc., that carries germs that cause disease
a mosquito that is the principal vector of yellow fever
Cite this Entry
“Vector.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/vector. Accessed 15 Jun. 2026.
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